Title :
Japanese R&D activities of multi-junction and concentrator solar cells
Author :
Yamaguchi, Masafumi ; Araki, Kenji
Author_Institution :
Toyota Tech. Inst., Nagoya, Japan
Abstract :
Japanese R&D activities of concentrator solar cells and systems are overviewed. Japan Energy developed high efficiency (31.7 % at 1-sun AM1.5G) InGaP/InGaAs/Ge 3-junction cell under support by NEDO (New Energy and Industrial Technology Development Organization) in addition to the world-record efficiency InGaP/GaAs//InGaAs 3-junction cell (33.3% at 1-sun AM1.5G) by Japan Energy, Sumitomo and TTI. This project is now taken over by Sharp and targeted to concentration application also supported by NEDO. The new target is 40 % efficiency under 500-sun concentration by March 2006. The SPFG (Single and non-alignment Photolithography Fine Grid) silicon cell is developed by TTI. The first prototype of non-imaging Fresnel lens, which expands acceptance half angle to 2°/12° and enabled low cost axis tracker was fabricated and tested by TUAT. The module with this nonimaging lens and the SPFG cell is now assembled and subjected to be tested.
Keywords :
solar cells; solar energy concentrators; 31.7 percent; 33.3 percent; InGaP-GaAs-InGaAs; InGaP-InGaAs-Ge; Japanese R&D; SPFG silicon cell; concentrator solar cell; multi-junction solar cell; nonimaging Fresnel lens; Costs; Gallium arsenide; Indium gallium arsenide; Lenses; Lithography; Photovoltaic cells; Prototypes; Research and development; Silicon; Testing;
Conference_Titel :
Photovoltaic Specialists Conference, 2002. Conference Record of the Twenty-Ninth IEEE
Print_ISBN :
0-7803-7471-1
DOI :
10.1109/PVSC.2002.1190701
